Terror of the Peaks

Flying
Spells your opponents cast that target this creature cost an additional 3 life to cast.
Whenever another creature you control enters, this creature deals damage equal to that creature's power to any target.

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Outlaws of Thunder Junction Promos

Outlaws of Thunder Junction

Flying
Spells your opponents cast that target Terror of the Peaks cost an additional 3 life to cast.
Whenever another creature enters the battlefield under your control, Terror of the Peaks deals damage equal to that creature's power to any target.

The amount of damage Terror of the Peaks deals is the entering creature's power as the triggered ability resolves. If that creature leaves the battlefield before the ability resolves, use its power as it last existed on the battlefield.